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Ultimo aggiornamento: 17 luglio 2026
MB to GB Converter
Creatori
Dharmendra SinghRevisori
Creatori
Dharmendra SinghRevisori
Quick Answer
The MB to GB Converter converts megabytes to gigabytes (and back) using either the binary standard (1 GB = 1,024 MB, used by computers and operating systems) or the decimal SI standard (1 GB = 1,000 MB, used by storage manufacturers). The discrepancy between these two systems explains why advertised drive capacities appear smaller once formatted. The calculator supports both conversion directions and labels the result with a storage category from Very Small through Huge.
To convert megabytes to gigabytes, divide by 1,024 using the binary system (computers) or by 1,000 using the decimal system (storage manufacturers). For example, 512 MB equals 0.5 GB in binary and 0.512 GB in decimal.
Punti Chiave
- In the binary (IEC) system, 1 GB = 1,024 MB — the standard used by operating systems and RAM.
- In the decimal (SI) system, 1 GB = 1,000 MB — the standard used by hard drive and SSD manufacturers.
- A 500 GB advertised drive shows as about 476 GB in Windows due to the binary/decimal discrepancy.
- The IEC introduced MiB and GiB to unambiguously denote binary megabytes and gigabytes.
- Always identify which system is in use before comparing storage capacities across different devices or specifications.
Creatori
Dharmendra SinghRevisori
Creatori
Dharmendra SinghRevisori
Formula
GB = MB / factor (binary: factor=1024 | decimal: factor=1000)
Dove:
- GB=Gigabytes(GB)
- MB=Megabytes(MB)
- f=Conversion Factor(dimensionless)
Esempi risolti
Convert 500 MB to GB (Binary)
A 500 MB file — common for a music album or software installer — converted using the binary standard.
- 1Identify the conversion factor: binary system uses 1 GB = 1,024 MB.
- 2Apply the formula: GB = MB / 1,024
- 3Calculate: GB = 500 / 1,024 = 0.4883 GB
- 4Storage category: Medium (between 0.1 and 1 GB).
Convert 1,000 MB to GB (Decimal)
Storage manufacturers use the decimal system. Converting 1,000 MB to GB using the SI decimal standard.
- 1Identify the conversion factor: decimal system uses 1 GB = 1,000 MB.
- 2Apply the formula: GB = MB / 1,000
- 3Calculate: GB = 1,000 / 1,000 = 1.0 GB exactly.
- 4Storage category: Large (between 1 and 10 GB).
Convert 8,192 MB to GB (Binary — 8 GB RAM)
A typical 8 GB RAM module contains exactly 8,192 MB in the binary system used by operating systems.
- 1Identify the conversion factor: binary system uses 1 GB = 1,024 MB.
- 2Apply the formula: GB = MB / 1,024
- 3Calculate: GB = 8,192 / 1,024 = 8.0 GB exactly.
- 4Storage category: Large (between 1 and 10 GB).
Introduzione
The MB to GB Converter instantly transforms megabytes into gigabytes — and back again — supporting both the binary standard (1 GB = 1,024 MB) used by operating systems and the decimal SI standard (1 GB = 1,000 MB) used by storage manufacturers. Understanding which system applies to your situation is key to avoiding confusion about available disk space, RAM capacity, and file sizes.
What Are Megabytes and Gigabytes?
A megabyte (MB) and a gigabyte (GB) are both units of digital information. A megabyte is commonly understood as one million bytes, while a gigabyte represents one billion bytes under the SI decimal standard — or 1,073,741,824 bytes under the binary IEC standard. These units are used to measure file sizes, storage capacity, RAM, and data transfer volumes. For related conversions within the digital storage hierarchy, see our KB to MB Converter and Byte Conversion Calculator.
Binary System vs Decimal (SI) System
Two competing standards define the relationship between MB and GB. Binary (IEC 80000-13): 1 GB = 2^10 MB = 1,024 MB. This is the standard used by computer operating systems (Windows, macOS, Linux), RAM chips, and virtual memory. Decimal (SI / metric): 1 GB = 10^3 MB = 1,000 MB. Hard drive and SSD manufacturers use this standard, also endorsed by the International System of Units. This is why a 500 GB hard drive appears as roughly 476 GB in Windows. According to NIST SP 330 (2019), the SI prefixes kilo-, mega-, and giga- strictly mean powers of 1,000.
Conversion Formula Explained
The conversion formula is: GB = MB / factor, where factor = 1,024 (binary) or 1,000 (decimal). Reverse: MB = GB x factor. Examples: 512 MB / 1,024 = 0.5 GB (binary); 512 MB / 1,000 = 0.512 GB (decimal); 2 GB x 1,024 = 2,048 MB (binary). The difference grows with larger values — a 1 TB drive (1,000,000 MB decimal) reports only about 931 GB in binary. See the IEEE Standard 1541-2002 for formal binary prefix definitions.
Real-World Storage Size Examples
Understanding MB and GB in context helps you plan storage needs. A high-res JPEG photo is about 5 MB (0.005 GB). An MP3 song is roughly 8 MB (0.008 GB). A short 4K video clip (1 min) is around 400 MB (0.39 GB). An HD movie (compressed) is typically 1,500 MB (1.46 GB binary). A Blu-ray movie (uncompressed) can reach 50,000 MB (48.8 GB binary). For speed-related conversions see our Mbps to Gbps Converter.
Why Hard Drives Show Less Space Than Advertised
The classic missing gigabytes puzzle: a manufacturer labels a drive 500 GB using decimal (500,000 MB). Your OS divides by 1,024 and reports approximately 476 GB. No storage is missing — only the unit definition differs. The same principle applies at every level: a 1 TB drive (10^12 bytes) becomes about 931 GiB in binary. The BIPM SI brochure at bipm.org documents the official decimal SI prefixes, while IEC 80000-13 standardises the binary prefixes MiB and GiB.
Storage Size Categories and Use Cases
Digital storage sizes span many orders of magnitude. Below 1 MB (Very Small): text files, configuration files. 1–100 MB (Small to Medium): photos, songs, documents. 100 MB–1 GB (Medium): short videos, software installers. 1–10 GB (Large): HD movies, game files, OS images. 10–100 GB (Very Large): 4K movies, AAA games, VM images. Above 100 GB (Huge): database backups, raw video, scientific datasets. Knowing the category helps choose appropriate storage media — USB drives for small files, external SSDs for large backups, cloud storage for multi-terabyte archives.
Scheda di Riferimento Rapido
MB and GB Quick Reference
Riferimento rapido • MB to GB Converter
GB = MB / 1,024 (binary) | GB = MB / 1,000 (decimal)Intervallo valido: Any non-negative value of MB or GB
Valori Comuni
⚠ Attenzione
- •Using binary when a device uses decimal (or vice versa) leads to incorrect capacity estimates.
- •Never assume which system is in use without checking the source specification.
- •Operating systems (Windows, macOS, Linux) historically use binary: 1 GB displayed by the OS means 1 GiB (1,024 MB).
- •Storage manufacturers use decimal: a 1 TB drive contains 1,000,000 MB decimally, not 1,048,576 MB.
Suggerimenti Pro
- →When buying storage, divide the advertised GB by 1.0737 to get the binary GB your OS will report.
- →For RAM, always use the binary system — RAM modules are manufactured in exact powers of 2.
- →Use the decimal system when calculating internet data costs, as ISPs usually bill in decimal GB.
- →To quickly estimate binary conversion: divide MB by 1,000 then subtract about 2.4% for a close approximation.
FAQ
How many MB are in 1 GB?
In the binary (IEC) system used by computers and operating systems, 1 GB = 1,024 MB. In the decimal (SI) system used by storage manufacturers, 1 GB = 1,000 MB. The difference matters when comparing advertised storage capacity with what your OS reports.
Why does my 500 GB hard drive show less space in Windows?
The manufacturer measures the drive using the decimal system (1 GB = 1,000 MB), but Windows uses the binary system (1 GB = 1,024 MB). So 500,000 MB divided by 1,024 gives approximately 488 GB. No storage is missing — only the unit definition differs.
What is the difference between MB and MiB (or GB and GiB)?
The IEC introduced mebibyte (MiB) and gibibyte (GiB) to unambiguously denote binary multiples: 1 MiB = 1,048,576 bytes and 1 GiB = 1,073,741,824 bytes. MB and GB technically refer to SI decimal values, but colloquially they are often used for binary values too. Technical documentation increasingly uses MiB and GiB for precision.
Which system should I use — binary or decimal?
Use binary (1,024) when working with OS-reported file sizes, RAM, virtual memory, or anything your computer measures. Use decimal (1,000) when comparing with advertised storage capacities from manufacturers, or when following SI metric standards in scientific or engineering contexts.
How do I convert GB back to MB?
Reverse the formula: MB = GB x factor. For binary: 2 GB x 1,024 = 2,048 MB. For decimal: 2 GB x 1,000 = 2,000 MB. Use the GB to MB direction option in this converter.
Is 1,000 MB equal to 1 GB on my phone?
It depends on the OS. iOS and modern Android (version 8 and later) use the decimal definition (1 GB = 1,000 MB) for storage display, aligning with manufacturer specifications. Older Android versions used the binary definition. Check your device settings to confirm which standard is applied.